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QUARTZ INVERTED-MESA BLANKS

Specifications


Q-IM blanks

Thickness of support rim = 66.15 ± 0.05 mm
PARAMETERS VALUES
Material - high grade quartz, Q (min) ,x106 2.0
Frequency range, MHz 50.00 ~ 400.00
Calibration tolerance , Df/fn, x10-3 ± 0.1
± 0.5
± 1.0
± 5.0
Diameter - Ø IM                                  mm
For frequencies : 50 ~ 150MHz
                         150 ~ 250MHz
                         250 ~ 400MHz
3.0
2.3
2.0
Zone A (no interference rings or stripes)
Diameter - ØA,                                   mm
for Ø IM: 3.0
             2.3
             2.0
Surface finish, zone A, Ra (max),µm

2.0
1.0
0.75
0.03 ~ 0.05
Blank geometry, type-I;
                         type-II		 two flats X or Z';
one flat X or Z';
Angle tolerance ±2'
Features
ETNA's quartz inverted-mesa (Q-IM) blanks are manufactured by original ion-thinning technology, in which an ordered flow of energetic ions provides for proper surface finish , flatness and thickness uniformity of the exposed to ions inverted- mesa part of the blank. High-grade quartz monocrystals hydrothermally- grown by VNIISIMS (Alexandrov, Russia) are used as a starting material for the blanks.